George a



(No Model.)

G. A. GOODSON, A. S. GAPEHART 8: G. L. TRAVIS. ART OF FORMING MATRICESFOR STER-EOTYPB PLATES.

No. 427,682. Patented May 13, 1890.

UNITED STATES PATENT OFFICE.

GEORGE A. GOODSON, ALEXANDER S. CAPEHART, AND CHARLES L. TRAVIS OFMINNEAPOLIS, MINNESOTA, ASSIGNORS TO THE MINNEAPOLIS ELEC- TROMATRIXCOMPANY, OF SAME PLACE.

ART OF FORMING MATRICES FOR STEREOTYPE-PLATES.

SPECIFICATION forming part of Letters Patent No. 427,682, dated May 18,1890;

Application filed March 29, 1889- Serial No. 305,256. (No model.)

To all whom it may cancerm cardboard, paper, or papier-machin a com- Beit known that we, GEORGE A. GOOD paratively thin sheet. Instead ofsupporting SON, a citizen of Canada, and ALEXANDER S. this matrix-sheetdirectly on a solid unyield- CAPEHART and CHARLES L. TRAVIS, citizensing anvil or support when making the im- 5 of theUnited States, residingat Minneapolis, pression, we place the same loosely upon a in the countyof Hennepin and State of Minbacking-sheet of yielding material,preferanesota, have invented certain new and useful bly of little or noelasticity, and then place Improvements in the Art of Forming Mathisbacking-sheet with the matrix-sheet upon triees or Molds forStereotype-Plates; and it on arigid anvil or support The two sheets 10we do hereby declare the following to be a are commonly held together bysuitable full, clear, and exact description of the inguides or clampingdevices at the edges, but vention, such as will enable others skilled inthey are otherwise left free and unconnected, the art to which itappertains to make and so that ihesurfaces in contact can move one usethe same. upon the other, and-the dies are preferably Our inventionrelates to the art of forming given such an extent of movement as toforce molds or matrices for stereotype-plates to be the material of thematrix-sheet outward to used in printing, and more particularly to someextent into the yielding backing-sheet, that branch of the art in whichthe said maso that each impression will be represented trices or moldsare made by impressing the on the reverse side by an elevation or em- 20characters successively into the matrix mabossing.

terial. In molds or matrices made in the manner In order that the moldor matrix may be and of the material above described it is adapted toproduce a satisfactory printingfound that the successive impressions areof plate, the characters must be sunk to a uniabsolutely the same depthand that they re- 2 5 form depth and must remain of their original taintheir depth and form after the dies are form and depth until the cast istaken. It withdrawn. The matrix material being in a is found that whensuccessive impressions thin sheet when placed in a suitable casting aremade in materials having no elasticity frame or bOX,l)l19 weight ofmetal. used to whatever each succeeding impression crowds form thestereotype-plate will press the same 30 or forces the material back uponthe previevenly against the supporting-surface upon ously-formedimpression, distorting the botwhich it is placed, so that the resultingcasttom and side walls of such previously-formed ing Will have theconfiguration desired and impression, so that perfect results cannot bethe face of the type will be even and possess obtained. It is also foundthat under the all the requirements for the highest class of 3 5conditions under which 1naterialssuch as printing.

Wood or card-board-possessing a certain In the accompanying drawings,Figure lie amount of elasticity have been heretofore a perspective Viewof the matrix-sheet, the employed, and under the modes of procedurebackingsheet, the die, and the anvil. Fig. 2 heretofore followed inusing the same, notis a partial elevation of the die with the ma- 40withstanding the impressions all may have triX and backing sheets insection. Fig. 3 is been made of an equal depth, a plate cast a sectionthrough. the matrix-sheet. 9o therefrom will be found to have the facesof In the figures, A designates the die, B the the characters not in thesame plane. The matrixsheet, C the backing-sheet, and I) the t printin-surface will, therefore, be uneven stationary anvil. During theformation of 45 and satisfactory results cannot be obtained the matrixas already stated, the sheet B lies therefrom. To obviate thesedifficulties when upon the backin sheet C, which in turn is 5 using thislatter class of material is the obupon the rigid anvil D, as shown inFig. 1. ject of our present invention, and in carrying With these partsin this position the die is the same into practice we prefer to employforced or driven into the face of the matrixsheet opposite the anvil, soas to form a character matrix or indentation. It will be seen that thematerial of the matrix-sheet is forced downward or outward 011 the backopposite the character as shown at a, a corresponding impression beingmade in the face of the supporting or backing sheet, as shown at c. Aportion of a completed matrix-sheet is shown in Fig. 3 with a matrix inone face and an elevation corresponding thereto on the opposite face.

It is to be distinctly understood that any form of machine for formingmatrices or impressions may be employed and that any suitable materialmay be employed for the ma trix-sheets, care being taken that they shallbe of such character as to receive and retain the impression of the diesand that the back ing-sheet shall be of a yielding character.

What we claim, and desire to secure by Letters Patent, is-

1. The method of forming stereotype molds or matrices, consisting insupporting a matrix-sheet of card-board or similar material on a secondindependent sheet of yielding material and embedding the diessuccessively into the face of the first-named sheet, substantially asdescribed.

2. The method of forming stereotype molds or matrices, consisting insupporting two independent sheets of card-board or like material upon afixed anvil or support and embedding the dies successively into the faceof the upper sheet, substantially as described.

3. The method hereindcscribed of forming at. In the art offormingmatrices for stereotype-plates, the process of forming card-boardor analogous matrix-plates, which consists in supporting the matrix cardor sheet on a yielding bed and forcing the dies successively into thecard or sheet so as to form embossed portions on the reverse side of thecard or sheet, substantially as described.

5. In the art of forming matrices for stereotype-plates, the process offorming card-board. matrix-plates, which consists in supporting matrixcards or sheets on a rigid bed with a sheet of similar characterinterposed between them and forcing the dies successively into the cardor sheet to an extent sufficient to produce embossed or erected portionson the reverse side of the matrix card orsheet.

In testimony whereof we affix our signatures in presence of witnesses.

GEORGE A. GOODSON. ALEXANDER S. CAPEHART. CHARLES L. TRAVIS.

Witnesses:

ROBT. F. GAYLORD, W. H. CHAPMAN, PARKER M. PAGE, FRANK HARTLEY.

